Calculation Of Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

The following table presents the computation of weighted-average shares used in the calculation of basic and diluted earnings per share:

	Year Ended December 31,
	2020	2019	2018
	(In thousands)
Weighted-average shares of common stock outstanding	115,058	118,513	113,452
Weighted-average potential shares of common stock outstanding:
Conversion spread related to subordinated convertible debentures	—	—	8,589
Unvested RSUs, and ESPP	240	455	620
Shares used to compute diluted earnings per share	115,298	118,968	122,661